/*

 * Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.security.provider;

import java.util.*;

import java.security.*;

import sun.security.rsa.SunRsaSignEntries;

import static sun.security.util.SecurityConstants.PROVIDER_VER;

/**

 * Provider used for verification of signed JAR files *if* the Sun and

 * SunRsaSign main classes have been removed. Otherwise, this provider is not

 * necessary and registers no algorithms. This functionality only exists to

 * support a use case required by a specific customer and is not generally

 * supported.

 *

 * @since  1.7

 * @author Andreas Sterbenz

 */

public final class VerificationProvider extends Provider {

    @java.io.Serial

    private static final long serialVersionUID = 7482667077568930381L;

    private static final boolean ACTIVE;

    static {

        boolean b;

        try {

            Class.forName("sun.security.provider.Sun");

            Class.forName("sun.security.rsa.SunRsaSign");

            b = false;

        } catch (ClassNotFoundException e) {

            b = true;

        }

        ACTIVE = b;

    }

    @SuppressWarnings("removal")

    public VerificationProvider() {

        super("SunJarVerification", PROVIDER_VER, "Jar Verification Provider");

        // register all algorithms normally registered by the Sun and SunRsaSign

        // providers, but only if they are missing

        if (ACTIVE == false) {

            return;

        }

        Provider p = this;

        Iterator<Provider.Service> sunIter = new SunEntries(p).iterator();

        Iterator<Provider.Service> rsaIter =

            new SunRsaSignEntries(p).iterator();

        // if there is no security manager installed, put directly into

        // the provider

        if (System.getSecurityManager() == null) {

            putEntries(sunIter);

            putEntries(rsaIter);

        } else {

            AccessController.doPrivileged(new PrivilegedAction<Object>() {

                public Void run() {

                    putEntries(sunIter);

                    putEntries(rsaIter);

                    return null;

                }

            });

        }

    }

    void putEntries(Iterator<Provider.Service> i) {

        while (i.hasNext()) {

            putService(i.next());

        }

    }

}